Evening star. [volume] (Washington, D.C.) 1854-1972, 1887-06-04
THE NEW STREET PAYMENTS.
How the Distillate and Asphalt block
PavementS are Laid.
THE WORK TO BE DOM THIS sUNMxR-THE DEPT
OF EXCAVATION AND THE MANNER OF PUTTING o.
THE WEARING SURFACE.

OF EXCAVATION AND THE MANNER OF PUTTING ON
THE WEARING SURFACE.
The greater portion OF street surface in the city
to be paved this year-in fact all the streets
scheduled in West Washington, and the north and
southwest sections-will be covered with the dis
ttRate pavement The space over which the pave
ment is to be laid WILL according to the directions
for laying such pavements be excavated to the
depth OF inches below the top surface OF the
pavement when completed. Any Objectionable OF
unsuitable material below the bed will be removed,
and the space filled with clean gravel or sand well
ranmed. The bed will then be trimmed SO as to
be exactly parallel to the surface Of the new pave
ment when completed, and the entire roadbed
will be thoroughly rolled.
THE BASE OR BINDER.
Upon this foundation will be laid the base and
binder, ~ inches in thickness, in the following
manner: The base will be composed of clean,
broken stone that will pass through inch ring.
well rammed and rolled with steam-rolIer to q
depth OF inches, and thoroughly coated with hot
the proportion of about l gallon to the square
yard of pavement. The second or binder course
VIII be composed OF clean, broken stone thorough
dimensions, and coa-tar distlllate The stone VIII
oe heated oy passing through revolving heaters,
uitate IN the proportion OF gallon of diStillate
to cubic foot Of stone The binder viii be hauled
20 tne Work, spread upon the base course at least
rolled with hand and heavy steam rollers while In
not and plastic condition.
THE WEARING SURFACE
VIII be IN inches thick when cOmpacted. made Of
paving cement, composed of 25 per cent of asphalt
ana 70 per cent OF coal-tar distillate mixed with
VIII De mixed with pulverized stone of such di-
mansions as to pass through inch screen in
the proportion q two to one 70 81 cubic feet Of
cement quart OF -four OF sulphur, and quarts
OF air. laEed lime. To this mixture will be added
~ ~ poanas OF paving cement to compose the wear
Ing surface. The material will be heated to about
SSUo Fahrenhelt, the paving cement in kettles,
the sand, stone, &C, in revolving heaters. They
VIII De thoroughly mixed by approved machinery
and the mixture carried upon the work. where it
VIII be spread upon the binder course 2 inches
thick with hot iron rakes and other suitable APP
pliances and Immediately compacted with lamp.
tng-1rOnS, hand and steam rollers in its hot and
plastic state. The surface will be finished with
busting OF dry hydraulic cement rolled In. The
pavement SO constructed must be solid mass 6
lncheS thlck, and will be thoroughly rolled and
cross-rolled until it has become hard and solid.
THE ASPHALT BLOCK PAVEMENT.
The streets in the other two sections will be laid
for the greater part with the asphalt block pave
ment. The size Of the blocks will be 4 by by IL
inches. The blocks will be composed OF paving
cement q 10 IL parts crushed limestone SO to 81
the paving cement will be made from refined Trim
petroleum. The space over which the pavement is
10 be laid will be excavated to the depth of II
Inches DeloW Inc Top line or the proposed pavement
when fully rammed. Any Objectionable or insult
aDie material below the bed will be removed and
the space filled with clean gravel or sand. All
holes and Inequalities Will be filled and the filling
cOmpacted by rolling or ramming. Upon this
foundation is to be laid bed OF fine bank gravel,
D Inches thick when cOmpacted by rolling and
rammlng. Upon this will be laid bed OF fine,
sharp sand, inches in thickness, to serve as a
oed ior the blocks which will be laid directly upon
and lmDedded In it with close joints.
HOW THE BLOCKS ARE LAID.
The blocks are to be laid at right angles with
the line OF the street, each course to be OF blocks
OF uniform width and depth, and so laid that all
longitudinal joints shall be broken by lap OF at
least four inches. Each course OF blocks VIII be
driven against the course preceding 1t by heavy
maui, In order to make the lateral Joints as tight
as possible, and the longitudinal points will be
closed by pressing each corner in the direction of
It's length by lever. When laid the blocks will
be Immediately covered with clean, fine sand.
They will then be carefully rammed by placing
plank over several courses and ramming the plank
with heavy rammer The ramming will be con.
t1nued until the blocks reach firm, unyielding
bed and present uniform surface, with proper
grade and crown.
The work will be commenced as soon as possible
by the contractors, who are ii. L. Crawford, the
Barber Company. and P. Maloney. The work OF
grading and regulating the streets will be done by
Andrew Gleason and w. H. Buckley.